Saw Blade: Which angles are there?

The geometry of saw blades determines which materials are cut as well, and what makes the saw blade particularly suitable. What angles there are with saw blades, and what they mean, read in this post.

Angle on conventional (oblong) saw blades

If you look at a conventional saw blade, you can identify different angles:

  • the cutting angle
  • the clearance angle and the
  • the wedge angle

The clearance angle is the angle at which the back of the teeth is horizontal. The angle of intersection, on the other hand, is the angle between the horizontal and the so-called tooth face (located opposite the back of the teeth). In contrast, wedge angle refers to the angle between the breast of one tooth and the back of the adjacent tooth.

These angles can be very different depending on the saw blade geometry and tooth shape. As a measure of the performance of a saw blade or its cutting properties are angles but only an indication for the expert - as a layman the different angles usually tell you not really much. Knowing from which angle each is mentioned, can still not hurt.

Angle at the circular saw blade

The circular saw blade also different tooth shapes and tooth spacing are common. An important distinguishing feature in relation to the leaves is also the so-called rake angle.

Positive and negative rake angles

The tooth position can be either forward or backward, depending on the rake angle. With a positive rake angle, the teeth of the saw blade are tilted forward and work hard into the wood. However, if the rake angle is too positive, the rip-off caused by the saw increases rapidly. In addition, positive rake angles are only suitable for soft materials.

A negative rake angle means that the tooth hits the workpiece at a very shallow angle. This is better for hard materials and clean saw cuts. The effort is also higher here than with a saw blade with a positive rake angle.

Tips & Tricks

When sharpening saws or saw blades, always make sure to guide the file at the correct angle. You must hit the cutting angle exactly so you can sharpen the saw or saw blade cleanly. As an aid, there are also file guides with integrated protractor, which can be precisely aligned and fixed at an angle.

Video Board: How to Adjust Table Saw Blade Angle for Precision Cuts